wrote in news:1108602143.346760.33310
@l41g2000cwc.googlegroups.com:

this does not look like great news for WAAS or LAAS. where is WAAS
actually functioning right now? (is there a map of applicable areas?)
or is it "so much for the heavily advertised WAAS features of the
GNS480"?

Approaches that use WAAS have been commissioned all over the US. IFR-
certified units that use WAAS are still rather rare, IME. WAAS doesn't
work with non-WAAS GPS units, so the aircraft has to be fitted with new
equipment, and it just isn't economically viable for most pilots.

But there is no need for a precision GPS approach at most airports. A
standard GPS approach works most of the time.

--
Regards,

Stan

"They that can give up essential liberty to obtain a little temporary
safety deserve neither liberty nor safety." B. Franklin